Any usefull examples of good coding practice in large programs

Hi, ive been writing code for about 10 years now. Know a good bit about labview now lmao! But want to get to know good code practices e.g. in creating large programs, code templates, avoiding race conditions, use of multiple loops and to be able to write code for clients as a contractor. Any one help me??
Stu
Solved!
Go to Solution.

Check out thelargeapp community and this KB article
Message Edited by Jeff Bohrer on 06-14-2010 04:49 PM
Jeff

Similar Messages

  • Good Coding practice

    Example of a nonsense code below
    for (int i=0; i < 10; i++)
        int total = i + 1;
    System.out.println(total);when excute, total will be redeclared 9 times, compiler doesn't complain. But is this clean?
    A better code below?
    int total;
    for (int i=0; i < 10; i++)
        total = i + 1;
    }

    My query is whether the "buffer" inside the loop ok?It's fine where it is. The compiler calculates how many slots on a stack
    are needed for all local variables. Those slots are allocated from the
    stack upon entry of the method and removed when the method returns.
    Note that the amount of slots needed is not necessarily the same as
    the total number of local variables:void foo() {
       int i; //  slot 1
       for (int j= 0; j < 10; j++) // slot 2
       for (int k= 0; k < 10; k++) // slot 2 again
    }kind regards,
    Jos

  • Good coding practice for object init

    We have a code that requires initializing instance of the object for each item in the loop. I have following option in mind. Please advice which one is the best option. TIA
    Option 1
    =======
    public class AThread extends Thread {
    private ObjectA var1 = null;
    private ObjectA var2 = null;
    public AThread() {
    this.var1 = new objectA();
    public void run() {
    while ( ... ) {
    if (var2 != null) {
    var2 = null;
    var2 = var1;
    var2.callmethod();
    Option 1
    =======
    public class AThread extends Thread {
    private ObjectA var1 = null;
    public AThread() {
    public void run() {
    while ( ... ) {
    var1 = new objectA();
    var1.callmethod();
    var1 = null;
    }

    1. If in the future, you post code, you can make it much more readable by enclosing it in the [code][/code] tags.
    2. Why not implement Runnable instead of extend Thread? You're not creating a new type of thread, so it is more "OO"-sensible to create a new Runnable and run it.
    3. In the first Option 1, you might as well just be doing
    while (...) {
      var1.callMethod();
    }Assigning the reference to another variable does not create a new instance of the object, so it is not worthwhile to create a new reference to it just to call its methods.
    4. In option 2, setting the object's reference to null at the end doesn't really help anything, because the object is going out of scope anyway and will be destroyed.
    Your question, really, between the two options, is as follows: should you recreate and destroy the object for every iteration through the loop, or just call the method multiple times?

  • Coding Practice for Bound Property Names

    I think this simply an issue over coding practices, but if I am right then all the tutorials and documentation on how to write Beans are promoting poor coding practices. Speicifcally, it bugs me that String literals are always used in all the code I see. As in the following code:
    class MyBean  {
       public void setValue(value newValue) {
          beansupport.firePropertyChange("value", oldValue,  value);
    }the practice that I have starting using is:
    class MyBean  {
        public static final String propertyValue = "value";
       public void setValue(value newValue) {
          beansupport.firePropertyChange(propertyValue, oldValue,  value);
    }This way, a PropertyChangeListener can refererence MyBean.propertyValue instead of using the literal "value" -- eliminating the chance for error and also there don't have to be multiple literals floating around using up space. Is there any reason this isn't commonly accepted practice or did I miss something?

    Strings appearing in source code can be reduced to a constant, like an enum. So it is likely that the code with strings is actually faster, as the value is known before compilation. It is easier to read. Keep in mind that strings get interned every now and then and thus get reduced to this equivalency:
    public method blah( "value", some stuff )...
    public method nah(*){ do stuff; let x = "value"; more stuff with "zoiks!" }
    ends up like
    key k1 = "value"
    key k2 = "zoiks!"
    what the jvm sees;
    public method blah( key1, some stuff )...
    public method nah(*){ do stuff; let x = key1; more stuff with key2 }
    The string values get "inlined" and can be checked during compilation, allowing for many optimisations not otherwise possible.
    Hope that helps a little.
    Andrew

  • Coding Practice(GV$SESSION)

    Hi
    Recently there was an issue of 1 procedure running in parallel through 2 different sessions and causing some irregular results.
    So, I changed the code in such a way that when the procedure runs then it sets the module and action in the GV$SESSION view.
    exec DBMS_APPLICATION_INFO.SET_MODULE ('MOD', 'ACT3000');
    So whenever the procedure runs it first checks in GV$SESSION whether ACTION with the name ACT3000 is running or not, if not it runs,else it exits.
    The question I have here is that is it a bad coding practice to select from the view GV$SESSION or any other system views in a procedure or an anonymous block?
    Regards
    Ankit

    The question I have here is that is it a bad coding practice to select from the view GV$SESSION or any other system views in a procedure or an anonymous block?Probably there's no general answer to this. Sometimes it is just necessary to to query system views, sometimes you might think it over again - in particular for performace reasons.
    In your case you also have the alternative of querying sys_context to get the information you wanted:
    SQL> select sys_context('userenv','module') module, sys_context('userenv','action') action from dual;
    MODULE                         ACTION
    SQL*Plus
    SQL>..whereby dual itself is a system view/table ;)

  • Best Coding Practices

    Hi
    are there any best coding practices for EP development?can anybody suggest the material?
    Prasad

    EP, as in Enterprise Portal?
    James

  • Good battery practices?

    I got an iphone today....and I love it!!!!!!!!
    I turned it on and have used it today and the battery is almost gone....should I wait until the battery is completely drained before I plug it into the wall socket? Also, is it good for the battery and the phone in general to leave it plugged into the wall all night long, like I did with my old cell phone?
    What are good battery practices in general for the iphone? I want to be able to use it without it dying out on me everyday, especially when I need to call someone. I don't know how to use it much....are there application or web things that I could turn off while they are not in use in order to conserve battery power? (How do I turn off edge? The E is constantly on the top of the screen...if I could turn it off, wouldn't that conserve power?)
    Any other conserving of power practices would be appreciated!
    Thank you!!!

    Apple put together a great page on the iPhone battery, check out the link below
    http://www.apple.com/batteries/iphone.html
    hope this helps

  • Good Battery Practice?

    I've just recently ordered my MacBook-- and though I haven't received it yet, I am still curious about good battery practice. If anything, I really want mine to last, and typically if asking just anybody off the street you'll get everything from "put your battery in the freezer" to "take out your battery, when not in use".
    Any thoughts? Should I charge it fully, then let it run out before I recharge? Should I use the adapter whenever I have the chance, regardless of the battery charge?
    I'm also curious whether I have to charge the battery before first use out of the box-- I looked through manual online, and I didn't see anything on that topic.

    intheam wrote:
    Any thoughts? Should I charge it fully, then let it run out before I recharge? Should I use the adapter whenever I have the chance, regardless of the battery charge?
    It is OK to leave your battery hooked to the charger most of the time. The only time I unhook mine from the charger is when I calibrate or for a few minutes to use in another room. You should calibrate every two months or so to keep the battery fully functioning. If you use your MacBook infrequently, it’s best to re-calibrate the battery at least once a month.
    It is best not to use your battery unless you need to. Some people have hurt their batteries by charging then discharging every time they use the MacBook. This will age a battery very fast and cause you to buy a battery sooner than you should have too. Don't discharge the battery just because you used it. Li-Ion batteries prefer small charges over big ones. Use it and then plug it in as soon as you can. The only time my Battery is ever fully discharged is when I'm doing a calibration.
    The following links have good information about the MacBook and the care of it's battery.
    Apple: Tips for maximizing your Notebook battery charge
    Apple MacBook and MacBook Pro: Reduces processor speed when battery is removed while operating from an A/C adaptor
    Apple portable computer's battery does not show a full charge in Mac OS X
    Look here and here for some good tips about battery care.
    Apple MacBook: How to remove or install the battery
    Apple: Determining Battery Cycle Count
    Apple: Use and cleaning of MagSafe power connector
    I'm also curious whether I have to charge the battery before first use out of the box-- I looked through manual online, and I didn't see anything on that topic.
    No just plug in your power supply and have fun. It will charge whie your using it. If you follow my other tips you should get long life out of the battery.

  • Where can you find free InDesign CS3 templates for newsletters, or free editable examples of good newsletters in the InDesign format?

    I am looking for free newsletter templates or free editable examples of good newsletters made using InDesign CS3.  Anyone know of a great spot for finding these?

    That would make sense if it opened a template folder but it opens the most recent Bridge folder I had open.
    Edit: Just tried it again and the template folder came right up. Thanks.

  • How to follow best coding practices and make this code runable.

    How to change this code to make it work and follow best coding practices.
    This code is to add fields to internal table LIST which already exist.
    In the loop are all the selections which are to be made.
    But i am new to ABAP and not sure how to make this work.
    please help me.
    DATA: wa_list LIKE LINE OF list,
          l_v_index TYPE i.
    DATA: t_price_result1 TYPE STANDARD TABLE OF komv WITH HEADER LINE INITIAL SIZE 0.
    DATA: wa_result LIKE LINE OF t_price_result1.
    LOOP AT list INTO wa_list.
      l_v_index = sy-tabix.
    *GET MATERIAL DOCUMENT(MBLNR) AND DELIVERY NUMBER(XBLNR)
      SELECT  mkpf~mblnr
              mkpf~xblnr
       into (wa_list-mblnr, wa_list-xblnr )
    *            INTO i_list
       from mkpf inner join mseg
    *   up to 1 rows
        on mkpf~mandt = mseg~mandt
        and mkpf~mblnr = mseg~mblnr
        and mkpf~mjahr = mseg~mjahr
        where mseg~matnr = wa_list-matnr
         and mseg~charg = wa_list-charg
         and mseg~kunnr = wa_list-kunnr
         and mseg~sobkz = wa_list-sobkz
         and mseg~werks = wa_list-werks
         and mkpf~budat in budat.
                                                                "RFC3762
      ENDSELECT.
      wa_list-mblnr = list-mblnr.
      wa_list-xblnr = list-xblnr.
    * GET POSNR FROM TABLE LIPS
      SELECT posnr
      FROM lips
      INTO list-posnr
      up to 1 rows
      WHERE vbeln = wa_list-xblnr AND
                 matnr = wa_list-matnr.
      ENDSELECT.
      wa_list-posnr = list-posnr.
    * GET SALES ORDER #
      SELECT vbelv
      FROM vbfa
      INTO list-vbelv
      up to 1 rows
    *        INTO wa_list
      WHERE vbeln =  wa_list-xblnr.
      ENDSELECT.
      wa_list-vbelv = list-vbelv.
    *GET PO
      SELECT bstkd
      FROM vbkd
      INTO list-bstkd
      up to 1 rows
      WHERE vbeln =  wa_list-vbelv
          AND posnr = 0.
      ENDSELECT.
      wa_list-bstkd = list-bstkd.
    *get serial number
      SELECT SINGLE obknr
       FROM ser01
       INTO list-obknr
       WHERE lief_nr = wa_list-xblnr
           AND posnr = wa_list-posnr.
    wa_list-obknr = list-obknr.
    SELECT sernr
    FROM objk
    INTO list-sernr
    up to 1 rows
    WHERE obknr = wa_list-obknr.
    ENDSELECT.
    wa_list-sernr = wa_list-sernr.
    *get date
    SELECT budat FROM mkpf
    INTO list-budat
    up to 1 rows
    where mblnr = wa_list-mblnr.
    ENDSELECT.
    wa_list-budat = list-budat.
    *get CLP
    SELECT   vkorg vtweg spart
    INTO (list-vkorg, list-vtweg, list-spart)
    up to 1 rows
    FROM vbak WHERE vbeln = wa_list-vbelv.
    ENDSELECT.
    wa_list-vkorg = list-vkorg.
    wa_list-vtweg = list-vtweg.
    wa_list-spart = list-spart.
    SELECT pstyv
    INTO list-pstyv
    FROM  vbap
    up to 1 rows
    WHERE vbeln = wa_list-vbelv AND posnr = wa_list-posnr.
    ENDSELECT.
    wa_list-pstyv = list-pstyv.
    CALL FUNCTION 'Z_SD_PRICING_CONDITION'
    EXPORTING
    i_organization                  = wa_list-vkorg
    i_dist_channel                  = wa_list-vtweg
    i_division                      = wa_list-spart
    i_customer                      = wa_list-kunnr
    i_plant                         = wa_list-werks
    *      i_pricng_date                   = sy-datum
    i_material                      = wa_list-matnr
    *   I_SALES_UNIT                    = 'EA'
    *   I_QUANTITY                      = '1.000'
    i_stor_loc                      = '0001'
    i_item_cat                      = 'TAN'
    *   I_AUART                         =
    *   I_REFRESH                       = 'X'
    *   I_KOMP                          =
    *   I_KOMK                          =
    * IMPORTING
    *   E_MES_TYPE                      =
    *   E_MES_NUMBER
    *   E_MESSAGE                       =
    TABLES
    t_price_result                  = t_price_result1
    * EXCEPTIONS
    *   CUSTOMER_NOT_FOUND              = 1
    *   PLANT_NOT_FOUND                 = 2
    *   MATERIAL_NOT_FOUND              = 3
    **   PLANT_MATERIAL_NOT_FOUND       = 4
    *   SALES_DATA_NOT_FOUND            = 5
    *   ORG_UNIT_NOT_FOUND              = 6
    *   UNABLE_TO_CALCULATE_PRICE       = 7
    *   UNABLE_TO_FORMAT_PRICE          = 8
    *   MANDATORY_INFOR_MISSING         = 9
    *   OTHERS                          = 10
    LOOP AT t_price_result1.
      IF  t_price_result1-kschl = 'ZPR2'.
        wa_list-kbetr = t_price_result1-kbetr.
      ELSE.
        wa_list-kbetr = 0.
      ENDIF.
    ENDLOOP.
    MODIFY list FROM wa_list INDEX l_v_index.
    ENDLOOP.

    Hi,
    Lets first start from your Select Statement.....Replace your SELECT ....ENDSELECT by SELECT Into Internal Table
    Your program is having a SELECT...ENDSELECT within LOOP...ENDLOOP........One should avoid doing this as far as possible.
    SELECT  mkpf~mblnr
                  mkpf~xblnr
    INTO itab
    for all entires i_list
    from    mkpf inner join mseg
        on   mkpfmandt = msegmandt
        and mkpfmblnr = msegmblnr
        and mkpfmjahr = msegmjahr
        where mseg~matnr = i_list-matnr
           and mseg~charg = i_list-charg
           and mseg~kunnr = i_list-kunnr
           and mseg~sobkz = i_list-sobkz
           and mseg~werks = i_list-werks
           and mkpf~budat in budat.
    Restructure youe complete code with this approach and Share your Finding's.
    You can also think of using a SAP Standard FM.
    Anyway..What is the objective/Output of this report?

  • Any setting example in congig.xml to create a NTRealm?

    Hi,
    Is there any setting example(in config.xml) for NTRealm since I am not able
    to create one from the admin console?
    Thanks!

    Hi,
    Is there any setting example(in config.xml) for NTRealm since I am not able
    to create one from the admin console?
    Thanks!

  • I need to use sigma plot in my Mac, does any one has a good advise for alternatives. If not, will it be ok to install windows in my mac?

    I need to use sigma plot in my Mac, does any one has a good advise for alternatives. If not, will it be ok to install windows in my mac?

    See if Deltagraph is still around.  We used to use that for plotting scientific data on Macs.  I don't know if it is at all transferrable with Sigmaplot if you have a colleague who uses it, but if you're doing this on your own I would look at getting DG vs, doing a dual boot  etc.

  • MQ + OpenLdap: Any working example of LDAP configuration?

    MQ + OpenLdap: Any working example of [LDAP configuration], [LDIF initial data] and [imobjmgr addTopicFactory/addTopic command] files ?
    I'm using Sun MQ3.5 + OpenLdap2.2.20 as jndi remote binding mechanism.
    I've unsuccessfuly tryed to add a Topic Factory!
    Running the command
         imqobjmgr -i add_ldap_topic_factory.poperties
    I get such an exception:
         javax.naming.OperationNotSupportedException:
         [LDAP: error code 53 - no global superior knowledge];
         remaining name 'cn=myTopicConnectionFactory'
    This is the test configuration adopted using rootdn user to write to LDAP repository:
    #slapd.conf
    include /usr/local/etc/openldap/schema/core.schema
    database     bdb
    suffix          "dc=imq,dc=com"
    rootdn          "cn=Manager,dc=imq,dc=com"
    rootpw          secret
    directory     /usr/local/etc/openldap/var/openldap-data
    index     objectClass     eq
    #test.ldif
    dn: dc=imq,dc=com
    objectClass: dcObject
    objectClass: organization
    dc: imq
    o: imq
    #add_ldap_topic_factory.poperties
    version=2.0
    cmdtype=add
    obj.type=tf
    obj.lookupName=cn=myTopicConnectionFactory
    obj.attrs.imqAddressList=mq://localhost:7676/jms
    objstore.attrs.java.naming.factory.initial=com.sun.jndi.ldap.LdapCtxFactory
    objstore.attrs.java.naming.provider.url=ldap://localhost:389/o=imq
    objstore.attrs.java.naming.security.principal=cn=Manager,dc=imq,dc=com
    objstore.attrs.java.naming.security.credentials=secret
    objstore.attrs.java.naming.security.authentication=simple
    Thanks for any suggestion,
    Silvano

    Agreed.
    I've been wanting to test the steps and write a tech article on this
    and post it to somewhere on sunsolve.sun.com but have not had
    time yet.
    In any case, the instructions Ken-shi gave are below including
    the 3 files (etang.ldif objectstore.properties slapd.conf). Not sure
    how messy this posting can get due to size of files.
    I'd much rather point you to a sunsolve article but don't want
    to make you wait. When I do post the sunsolve article, this thread
    will be updated with a ptr to it.
    ===Begin instructions===
    Attached please see my working configuation files.
    1.Modify your OpenLdap configuration. (see slapd.conf)
    start OpenLdap: ./slapd
    2.Modify you initial data.( see etang.ldif)
    load initial data: ldapadd -x -D "cn=Manager,dc=etang,dc=com" -W -f
    etang.ldif
    3.ObjectStore properties ( see objectstore.properties )
    create your object store with "Administration" GUI on windows;
    while creating destinations or connection factories, be sure that the
    lookup names start with "cn=".
    ===End instructions===
    ===Begin etang.ldif===
    dn: dc=etang,dc=com
    objectClass: dcObject
    objectClass: organization
    dc: etang
    o: Etang Corporation
    description: The etang corporation
    dn: cn=Manager,dc=etang,dc=com
    objectClass: organizationalRole
    cn: Manager
    description: Directory Manager
    dn: o=IMQ,dc=etang,dc=com
    objectClass: organization
    o: IMQ
    dn: ou=imqusers,o=IMQ,dc=etang,dc=com
    objectClass: organizationalUnit
    ou: imqusers
    dn: cn=admin,ou=imqusers,o=IMQ,dc=etang,dc=com
    objectClass: person
    cn: admin
    sn: admin
    userPassword: admin
    dn: cn=guest,ou=imqusers,o=IMQ,dc=etang,dc=com
    objectClass: person
    cn: guest
    sn: guest
    userPassword: guest
    ===End etang.ldif===
    ===Begin objectstore.properties===
    java.naming.provider.url ldap://10.1.0.195:389/o=IMQ,dc=etang,dc=com
    java.naming.factory.initial com.sun.jndi.ldap.LdapCtxFactory
    java.naming.security.principal cn=admin,ou=imqusers,o=IMQ,dc=etang,dc=com
    java.naming.security.authentication simple
    java.naming.security.credentials admin
    ===End objectstore.properties===
    ===Begin slapd.conf===
    # See slapd.conf(5) for details on configuration options.
    # This file should NOT be world readable.
    include          /usr/local/openldap/etc/schema/core.schema
    include /usr/local/openldap/etc/schema/cosine.schema
    include /usr/local/openldap/etc/schema/inetorgperson.schema
    include /usr/local/openldap/etc/schema/dyngroup.schema
    include /usr/local/openldap/etc/schema/java.schema
    include /usr/local/openldap/etc/schema/nis.schema
    include /usr/local/openldap/etc/schema/misc.schema
    # Define global ACLs to disable default read access.
    # Do not enable referrals until AFTER you have a working directory
    # service AND an understanding of referrals.
    #referral     ldap://root.openldap.org
    pidfile          /usr/local/openldap/var/run/slapd.pid
    argsfile     /usr/local/openldap/var/run/slapd.args
    # Load dynamic backend modules:
    # modulepath     /usr/local/openldap/libexec
    # moduleload     back_bdb.la
    # moduleload     back_ldap.la
    # moduleload     back_ldbm.la
    # moduleload     back_passwd.la
    # moduleload     back_shell.la
    # Sample security restrictions
    #     Require integrity protection (prevent hijacking)
    #     Require 112-bit (3DES or better) encryption for updates
    #     Require 63-bit encryption for simple bind
    # security ssf=1 update_ssf=112 simple_bind=64
    # Sample access control policy:
    #     Root DSE: allow anyone to read it
    #     Subschema (sub)entry DSE: allow anyone to read it
    #     Other DSEs:
    #          Allow self write access
    #          Allow authenticated users read access
    #          Allow anonymous users to authenticate
    #     Directives needed to implement policy:
    # access to dn.base="" by * read
    # access to dn.base="cn=Subschema" by * read
    # access to *
    #     by self write
    #     by users read
    #     by anonymous auth
    # if no access controls are present, the default policy
    # allows anyone and everyone to read anything but restricts
    # updates to rootdn. (e.g., "access to * by * read")
    # rootdn can always read and write EVERYTHING!
    access to * by * write
    # ldbm database definitions
    database     bdb
    suffix          "dc=etang,dc=com"
    rootdn          "cn=Manager,dc=etang,dc=com"
    # Cleartext passwords, especially for the rootdn, should
    # be avoid. See slappasswd(8) and slapd.conf(5) for details.
    # Use of strong authentication encouraged.
    rootpw          secret
    # The database directory MUST exist prior to running slapd AND
    # should only be accessible by the slapd and slap tools.
    # Mode 700 recommended.
    directory     /usr/local/openldap/var/openldap-data
    # Indices to maintain
    index     objectClass     eq
    ===End slapd.conf===

  • Is there any code example for "Web Survey"?

    Hi buddies,
    In the standard SRM Web Survey scenario, the experts submit questionnaire online. But our custmer want it offline.
    So we use offline Adobe Forms, the problem is after we get the data by uploading the offline PDF, how we put the data into the standard Web Survey. Is there any function moudle , BAPI, class for this purpose?  Is there any code example?
    Thanks!
    Hao

    I have tried to write some report using pch logical database and successed.
    在报表自身中，从 GET OBJEC 点，作为规定，数据库驱动程序将文件 PLOG 中的选定的选择恢复为规定的并检查权限。
    指令 TABLES 中结构声明是前提。若除了结构 OBJEC，还定义结构 GDSTR，则将结构评估的参数添加到标准选择屏幕。这可以通过评估路径进行结构评估。
    REPORT  ZPHC_TEST.
    TABLES : objec.
    infotypes: 1000.
    INITIALIZATION.
    START-OF-SELECTION.
    get objec.
    WRITE : p1000-objid.
    end-of-SELECTION.

  • Any recomendation to a good Converter Software? .MOV to .M4P .WMP?

    Any recomendation to a good Converter Software? .MOV to .M4P .WMP?
    I have a .mov file of 2.44GB... and I need to reduce that by converting it to other format... So I was looking for a good software free for Mac.
    Thanks'

    You'll need additional for .wmv conversion. Flip4Mac isn't free (the player is free, but not the upgrade to convert).

Maybe you are looking for